title: From the Centers for Disease Control. Influenza activity--United States, 1989.
mesh_terms: D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D006801:Humans; D007223:Infant; D007251:Influenza, Human / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology